Receiver for wireless telegraphy.



R. B. AVERY.

RECEIVER FOR WIRELESS TELEGRAPHY.

APPLICATION FILED APR. 5, 1913.

1,1,. Patented June 22, 1915.

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RECEIVER FOR WIRELESS TELEGRAPHY.

Application filed April 5, 1913. Serial NR1.- 759,205.

To aZZ whom it may concern Be it known that 1, Ross B. AVERY, a citizen of the United States, residing at South Bend, in the county of St. Joseph and State of Indiana, have invented certain new and useful improvements in Receivers for Wireless Telegraphy, of which the following is a specification.

The invention relates to wireless telegraph receiving devices or oscillation detectors, comprehending specifically a device of this class adapted for use in connection with the ordinary commercial lighting circuit.

As a result of experiment I have found that the commercial alternating lighting and power circuit has its strength of current affected by the electric impulses from a wire less station, and to take advantage of this fact have devised an apparatus for the recording of such impulses.

The invention in its preferred form of details will be described in the following specification, reference being had particularly to the accompanying drawings, in which the figure represents diagrammatically the improved oscillation detector.

ln the following description it is to be understood that the parts illustrated and described illustrate conventionally certain well-known types of devices and that I contemplate the use of any specific type of the particular device that may be known or can be used, and that the term employed to designate a particular device is intended to include any and all types of such devices that may be available.

In the specific type of device used 1 represents a step-up transformer, the primary 2 of which is connected by conductors 3 with an ordinary alternating current lighting or power circuit, the connection being made preferably by the ordinary plug and socket connection. One terminal 4: of the secondany 5 of the transformer is connected through an adjustable spark gap instrument 6, while the opposing terminal 7 of the secondary is connected to a plate 8 of conducting material. Beyond the spark gap instrument '6 the current is led through a conductor 9 to a second conducting plate 10. The plates 8 and 10 are separated by a strip of insulating material 11, to prevent direct contact of the plates, and plate 10 is supported at its upper end for a limited swinging movement with relation to the plate 8.

A make-and-hreal: instrument '12 is ar ranged adjacent the plate including uprights 13 and 14c the former of which adjustably supports what may be termed a fixed contact 15 and the latter an adjusting screw 16 connected by a tension spring 17 with a movable contact 18 arranged in line with the fixed contact. The movable-contact is directly supported in an arm 19 pivotally mounted on the insulating base 20 of the instrument and connected by a flexible connector, such as cord or the like, 21 to the movable plate 10. The respective contacts of the make-andbreak instrument are in circuit through conductors 22, 23, with a recording instrument 24, a battery, or other source of energy 25, being included in the circuit.

The recorder 24 may be of any type, such for example as a sounder, duplex recorder, lamp, or other type of device which will be affected by the electric impulses.

In adjusting the device for operation the spark gap is adjusted until just sufiicient gap is provided to revent the voltage of the secondary coil 0 the transformer from bridging it. The tension of the spring 17 is then adjusted to just maintain the contact separated. The wireless impulses from the sending station are in part at least collected on' the transmission line of the power or lighting circuit being used with the effect Specification. of Letters Patent. Patented June 22, 1915.

to increase the current so that it will bridge the gap of the spark gap device and reach the conducting plates. The movable plate is attracted with the effect to bring the contact of the make-and-break instrument into elec trical connection and close the local circuit through the recorder. The signals evidenced by the wireless wave" oscillation are thusfaithfully reproduced on the recorder.

The instrument provides a simple and effective device for recording wireless messages through the aid of the transmission lines of a power or lighting circuit and thus avoids the necessity of the usual aerial and connections.

What is claimed is LA wireless wave detector including a signaling instrument, a local circuit there for, means for opening and closing said local circuit, a step-up transformer having the primary thereof in'circuit with a normallyenergized circuit, an electrostatic element in circuit with the secondary of the transformer, a spark-gap in the secondary circuit and means operated by saidelement to consignaling instrument, a local circuit theree for, a make and break device'for said local circuit, a step-up transformer having the primary thereof in circuit with a normally energized circuit, an electrostatic device in c1rcu1t with the secondary of the trans-' former, a spark-gap control in circuit with the electrostatic' device, and a mechanical connection between the electrostatic device and the make and break.

In testimony whereof I aifix my signature in presence of two witnesses.

ROSS B. AVERY.

- Witnesses: WILL G. CRABJLL,

SAMUEL PARKER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

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